BSCI 105 Study Guide - Final Guide: Electron Shell, Alpha And Beta Carbon, Asymmetric Carbon

• School: University of Maryland
• Department: Biological Sciences Program
• Course: BSCI 105
• Professor: Norma Allewell

Document Summary

Basic chemistry, structure of atoms, chemical bonds and polarity, h2o: Elements = contains only one type of atom, cannot be broken downcompounds= contain more than one type of atom, can be broken down (ex: h2o) Atomic number= # of protons= number of electrons when neutral atomic mass = # protons + # neutrons. Problem: how many covalent bonds can oxygen with an atomic number of 8 make with hydrogen: 2 b) 4 c) 6 d) 8. Enantiomers:enantiomer = molecules with a mirror plane of symmetry, must have asymmetric carbon (carbon with four different groups attached) 1 shell = 2 electrons 2 nd shell = 8 electrons 3 rd shell = 8 electrons. Right = atom gets smaller because more mass(stronger positive charge) and stronger pull between protons and electrons, more electronegative. Down = more orbitals, bigger size, weaker electronegativity up = stronger electronegativity, usually gets smaller. Chemical bonds:covalent bonds = atoms share one or more valence electronsionic bonds.